test/langtools/tools/javac/classfiles/InnerClasses/SyntheticClasses.java

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/** @test
 *  @bug 8034854
 *  @summary Verify that the InnerClasses attribute has outer_class_info_index zero if it has
 *           inner_name_index zero (for synthetic classes)
 *  @compile SyntheticClasses.java
 *  @run main SyntheticClasses
 */

import java.io.*;
import java.util.*;
import java.lang.classfile.*;
import java.lang.classfile.attribute.*;

public class SyntheticClasses {

    public static void main(String[] args) throws IOException {
        new SyntheticClasses().run();
    }

    private void run() throws IOException {
        File testClasses = new File(System.getProperty("test.classes"));
        for (File classFile : Objects.requireNonNull(testClasses.listFiles(f -> f.getName().endsWith(".class")))) {
            ClassModel cf = ClassFile.of().parse(classFile.toPath());
            if (cf.thisClass().asInternalName().matches(".*\\$[0-9]+")) {
                EnclosingMethodAttribute encl = cf.findAttribute(Attributes.enclosingMethod()).orElse(null);
                if (encl != null) {
                    if (encl.enclosingMethodName().isPresent())
                        throw new IllegalStateException("Invalid EnclosingMethod.method: " +
                                                        encl.enclosingMethodName().get().stringValue() + ".");
                }
            }
            InnerClassesAttribute attr = cf.findAttribute(Attributes.innerClasses()).orElse(null);
            if (attr != null) {
                for (InnerClassInfo info : attr.classes()) {
                    if (cf.majorVersion() < 51)
                        throw new IllegalStateException();
                    if (info.innerName().isEmpty() && info.outerClass().isPresent() )
                        throw new IllegalStateException("Invalid outer_class_info: " +
                                                        info.outerClass().get().asInternalName() +
                                                        "; inner_name is empty");
                }
            }
        }
    }
}

class SyntheticConstructorAccessTag {

    private static class A {
        private A(){}
    }

    public void test() {
        new A();
    }
}

class SyntheticEnumMapping {
    private int convert(E e) {
        switch (e) {
            case A: return 0;
            default: return -1;
        }
    }
    enum E { A }
}

interface SyntheticAssertionsDisabled {
    public default void test() {
        assert false;
    }
}